BaseTools: support the NOOPT target with the GCC tool chains
BaseTools: support the NOOPT target with the GCC tool chains

Update the tools_def.template to add NOOPT support with GCC tool chains.
Also disable -flto and -Os in NOOPT target for GCC5.

Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Reviewed-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Tested-by: Bruce Cran <ce547a98b2631aa2d77a4879bbd4113e9564a44b@sandisk.com>

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